title: Electron microscopy and L-dopa reaction in the evaluation of an unusual amelanotic malignant melanoma of the neck.
abstract: A 28-year-old white man with a neck mass is described. A diagnosis of amelanotic melanoma was made by L-dopa reaction and electron microscopy. This tumor could represent a metastasis from an unknown primary or a primary that had undergone spontaneous regression. It could also be a rare primary tumor of the cervical sympathetic chain. Electron microscopy and the L-dopa reaction are emphasized as important adjuncts in the diagnoses of amelanotic melanoma.
mesh_terms: D000328:Adult; D006258:Head and Neck Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000648:ultrastructure; D006801:Humans; D007980:Levodopa; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000473:pathology / Q000648:ultrastructure; D008853:Microscopy; D008854:Microscopy, Electron
chemical_list: D007980:Levodopa